• The MOSFET as a Switch

    The Metal Oxide Semiconductor Field Effect Transistor (or MOSFET) has proved over the past 15 years to be a very attractive alternative to the BJT. In recent years the MOSFET has become the preferred technology mainly because manufacturing improvements have advanced further with FET processes compared to bipolar processes....

    2017-12-02 16:08:44 viya 134

  • Low-Power Schottky - 74LS Series

    The low-power Schottky clamped TTL logic family (74LS series) was released i〇 1975. This, as the name suggests, has a lower power dissipation than the 74S series. A circuit diagram for a two-input NAN...

    2017-12-01 18:24:04 viya 145

  • Schottky Clamped TTL - 74S Series

    The standard TTL series has a typical propagation delay of 10ns (the term propagation delay was introduced in Chapter 4 and will be covered in more detail later hauler) By this we mean that when an input change occurs it takes 10 ns for effect to propagate to the output. In the early 1970s it was found that this for this propagation delay could be decreased by replacing those transistors that saturate clamped transistors....

    2017-12-01 18:20:13 viya 139

  • The Totem-Pole Output Stage

    At the output of all gates there is a capacitive load (CL) caused by the input capacitance of the next stage. This could be a printed circuit board interconnect or quite simply an oscilloscope lead....

    2017-12-01 18:16:00 viya 156

  • The BJT as a Logic Gate

    Diode transistor logicThe DTL or diode transistor logic first became available commercially in 1962. The circuit diagram for a two-input DTL NAND gate is shown in Fig. 9.2(a) and although it is no lon...

    2017-11-30 18:48:11 viya 119

  • The Bipolar Junction Transistor

    The bipolar junction transistor or BJT as it is more commonly known can be considered in digital terms as a simple single-pole switch. It physically consists of three layers of semiconductor (which can be either N-type or P-type) of which two transistor types exist - NPN or PNP....

    2017-11-30 18:46:08 viya 101

  • Choosing a Means of Implementation

    So far we have seen how to design both combinational and sequential circuits. These will, on paper, successfully perform many different functions but may well fail if the practicality of the hardware implementation issues are ignored....

    2017-11-30 18:45:18 viya 88

  • What is Moore Model Circuit?

    Now we shall design a D-type based circuit that will count up or down, under the control of a single external input, through the first five prime numbers (in binary). We must ensure that the circuit will return to state (binary count o〇 1 if an unused state is entered....

    2017-11-25 16:44:31 viya 108

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